(19)

(11)

EP 0 650 468 A1

(12)

(43) Date of publication: 03.05.1995 Bulletin 1995/18 (21) Application number: 93915037.0 (22) Date of filing: 17.05.1993

(51) International Patent Classification (IPC):  C04B 41/ 87( . ) C04B 35/ 80( . ) C04B 41/ 81( . ) C04B 35/ 645( . ) C04B 41/ 45( . ) (86) International application number: PCT/SE1993/000432 (87) International publication number: WO 1994/002432 (03.02.1994 Gazette 1994/04)

(84) Designated Contracting States: DE FR GB IT SE (30) Priority: 17.07.1992 SE 19920002195 (71) Applicant: SANDVIK AKTIEBOLAG S-811 81 Sandviken 1 (SE)	(72) Inventor: COLLIN, Marianne S-122 36 Enskede (SE) (74) Representative: Östlund, Alf Olof Anders, et al  Sandvik AB Patent Department S-811 81 Sandviken S-811 81 Sandviken (SE)